P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3

P0300 CHEVROLET Causes

  • Faulty spark plug (s)
  • Faulty ignition coil (s)
  • Clogged or faulty fuel injector (s)
  • Intake air leak
  • Fuel injectors harness is open or shorted
  • Fuel Injectors circuit poor electrical connection
  • Ignition coils harness is open or shorted
  • Ignition coils circuit poor electrical connection
  • Insufficient cylinders compression
  • Incorrect fuel pressure
  • P0300 CHEVROLET Notes

    The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are a common caused of multi-cylinder misfiring. If no leak is found the next step is to replace the spark plugs. If the problem persists more tests needs to be done to diagnose the problem, see "Possible Causes".

    There are factory service bulletins for the following Chevrolet models:

    2000 Chevrolet S-10
    2000-2008 Chevrolet Camaro
    2000-2008 Chevrolet Lumina
    2000-2008 Chevrolet Cavalier
    2000-2003 Chevrolet Impala
    2000-2003 Chevrolet Malibu
    2000-2003 Chevrolet Monte Carlo
    2000-2003 Chevrolet Silverado
    2000-2003 Chevrolet Suburban
    2000-2003 Chevrolet Tahoe
    2000-2003 Chevrolet Venture
    2001-2008 Chevrolet Express
    2002-2008 Chevrolet Astro
    2000-2003 Chevrolet Avalanche
    2000-2003 Chevrolet Trailblazer
    2003-2008 Chevrolet Blazer
    2003-2008 Chevrolet S-10
    2003-2008 Chevrolet Trailblazer EXT
    2000-2008 Chevrolet Factory Service Bulletin OBDII Code P0300

    2014 Chevrolet Silverado 1500
    2014-2016 Chevrolet Corvette
    2015-2016 Chevrolet Silverado, Suburban, Tahoe
    2016 Chevrolet Camaro
    Chevrolet Factory Service Bulletin OBDII Code P0300


    2002 Chevrolet Blazer P0300 Misfire Diagnostics





    User Submitted Video

    Cost of diagnosing the P0300 CHEVROLET code

      Labor: 1.0

      The cost of diagnosing the P0300 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

    P0300 CHEVROLET Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/loss of power
  • Hard start
  • Engine hesitation
  • P0300 CHEVROLET Description

    When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

    P0300 CHEVROLET Information for specific Chevrolet models

  • P0300 2002 CHEVROLET TRAIL BLAZER